BENSON BSHH Series Guide

1403BSHH_AMEN
1403BSHH_AMEN,page 1/29
PRE-ENGINEERED VENTILATION AIR HANDLER
BSHH range (indoor system)
Centrifugal Blown, Forced Convection Appliances with
Automatic Ignition and Fanned Flues for use as Multiple
Type B & C Appliances
INSTALLATION
COMMISSIONING
SERVICING
These appliances meet the following EC Directives
DIR 2009/142/EC:GAD
DIR 2004/108/EC:EMC
DIR 2006/95/EC: LVD
DIR 2006/42/EC:MD
Please read this document carefully before commencing the installation and leave it with the user or
attached to the appliance or gas service meter after installation!
WARNING
Improper installation, adjustment, alteration, service or maintenance can cause property damage, injury
or death. All work must be carried out by appropriately qualified persons.
The manufacturer does not take any responsibility in the event of non-observance of the regulations
concerning the connection of the apparatus causing an evil operation possibly resulting in damage to the
apparatus and/or environment in which the unit is installed
Ambi-Rad Limited
Fens Pool Avenue, Brierley Hill, West Midlands DY5 1QA (United Kingdom)
Tel : [phone]
Fax : [phone]
[email protected]
www.ambirad.co.u
Subject to modifications

1210SHH_AMEN,page 2/29
Contents
1. General
1.1 General
1.2 Warranty
2. Moving and Uncrating
3. Technical Data
4. Configurations and Dimensions
5. Location and Installation
5.1 BSHH model
5.2 Duct connections
6. Combustion Air Supply and Flue System
6.1 General
6.2 Type B appliances
6.3 Type C appliances
7. Gas Connection
8. Electrical Connection
8.1 Electrical supply & connections
8.2 Thermostat controls
8.3 Fan motors
8.4 Wiring diagram
9. Commissioning, Lighting and Operation
9.1 Commissioning
9.2 Ignition system
9.3 Operation
9.4 Burner gas pressure adjustment
10. Two Stage Burners Setting and Adjustment
11. Gas Conversion
12. Maintenance
12.1 Maintenance schedule
12.2 Heat exchanger maintenance
12.3 Burner maintenance
12.4 Burner orifice
12.5 Ignition system
12.6 Fan motor, fan
12.7 Venter motor & wheel
12.8 Operating gas valve
12.9 Combustion air pressure switch
12.10 Limit controls
12.11 Fan delay relay
12.12 Flue and combustion air piping
12.13 Air filters
13. Troubleshooting
14. Spare Parts List
15. User Instructions
If optional equipment was ordered and supplied with this heater, please refer to additional instructions for
option(s).
GENERAL
1.1 General
BSHH units are design certified to the CE EN 1020
standard for use in industrial and commercial
installations only. All models and sizes are available for
use with either natural, propane or butane gas with
operating temperature between -15°C and 40°C. The
type of gas, input rate and the electrical supply
requirements are shown on the heating rating plate.
Before installation, check if the appliance as described
on the packaging label is in accordance with the correct
type and model as specified on the data plate and
complies with your customer order.
The installation manual is shipped with the heater. Verify
that the literature is correct for the heater being
installed. If the manual is incorrect for the heater,
contact the supplier before beginning installation. The
instructions in this manual apply only to the models
listed.
Installation should be done by a suitable qualified
installer in accordance with these instructions. The
installer is responsible for the safe installation of the
heater. BSHH heaters have a titanium stabilised primary
heat exchanger with a Macro ChannelTM secondary heat
exchanger.
After unpacking the appliance leave it fastened to the
wooden blocks until just before siting to prevent damage
to the base frame.
Please read this document before commencing
installation.
These instructions are only valid for the country of use
as indicated on the appliance i.e. GB - IE. If these
symbols are not shown, it is necessary to obtain
appropriate technical instructions, which will provide
information concerning the necessary modification of the
appliance for the conditions of use in the country
concerned. Such instructions may be obtained upon
request from your supplier.
Check if the local distributions conditions of electricity
supply, type of gas and pressure of the appliance are
compatible with the data plate. When installed in Great
Britain the total installation must comply with the
requirements and recommendations of British Standard
BS 6230 1991 “Installation of Gas Fired Forced
Convection Air Heaters for Commercial and Industrial
Space Heating".
The installation must also be in accordance with the
relevant requirements of "The Gas Safety (Installation
and use Regulations) and “Amendment regulations 1990"
and the "Building and "Electrical Regulations" (in GB the
IEE Regulations).
The requirements of the "Local Building Standards
office", the premises "Insurance" undertaking and the
"Fire Office" must also be observed.
1

1403BSHH_AMEN,page 3/29
Unauthorised modification of this appliance or departure
from use in the manner, for which it was intended by the
manufacturer or installed in a manner contrary to these
instructions, may constitute a hazard and jeopardize all
warranties.
Deviations should only be carried out after formal
consent has been obtained from the manufacturer.
Ensure the environment in which the air heater will be
installed will not create a hazard i.e. where excessive
(volatile) dust, flammable or corrosive substances and/or
vapours and combustible materials may be present.
This appliance has been tested and set according to the
data plate before leaving the factory.
1.2 Warranty
Warranty is void if :
a.Heaters are used in atmospheres containing
flammable vapours or atmospheres containing
chlorinated or halogenated hydrocarbons or any
contaminant (silicone, aluminium oxide, etc…)
that adheres to the spark ignition flame sensing
probe.
b. Wiring is not in accordance with the diagram
furnished with the heater.
c. Unit is installed without proper clearance to
combustible materials or without proper
ventilation and air for combustion.
d. Air throughput is not adjusted within the range
specified on the rating plate.
MOVING and UNCRATING
This unit was test operated and inspected at the factory
prior to packaging and was in proper operating condition.
Before leaving the factory, the unit is completely
assembled. If the heater has incurred damage in
shipment, document the damage with the transport
company and contact your supplier.
Read this booklet and become familiar with the
installation requirements of your unit. If you do not have
knowledge of local requirements, check with the gas
supplier and any other local agencies that might have
requirements concerning this installation.
Before beginning, make preparations for necessary
supplies, tools and manpower.
IMPORTANT
If the installation includes optional vertical louvers or
downturn nozzle etc., install these options before the
heater is suspended. Follow the instructions included in
the option package.
When transporting the appliance after it has been
unpacked (i.e. fork lifting, etc) note the restrictions and
recommendation indicated in figure 1.
The base frame contains internal support member, which
acts as a lifting fulcrum point to prevent damage to the
underside of the appliance by lifting forks.
Figure 1: Appliance Handling Criteria
Minimum fork length requirement : min. 2/3 of unit length
Minimum fork width for balance
2
WRONG
WRONG

1210SHH_AMEN,page 4/29
TECHNICAL DATA
Tabel 1 :
BSHH 055 083 102
Gas category 'Cat.' II2H3+
Combustion air & flue type B22p-B52-C12-C32-C42-C52-C62-C82
Heat input (Hs) kW 58.60 87.68 107.66
Heat input (Hi) kW 52.80 79.00 97.00
Heat output 100% (Hi) kW 53.86 80.19 98.94
Heat output 50% (Hi) kW 26.93 40.10 49.47
Thermal efficiency 100% (Hi) % 102.6 101.4 102.2
Burner pressure 100% (G20) 1) mbar 8.30 10.40 8.80
Burner pressure 50% (G20) 1) mbar 2.08 2.60 2.20
Burner pressure 100% (G31) mbar 15.70 34.36 23.50
Burner pressure 50% (G31) mbar 3.92 8.59 5.87
Burner pressure 100% (G30) mbar 12.31 26.93 18.42
Burner pressure 50% (G30) mbar 3.07 6.73 4.60
Nat. Gas (G20) mm6.80 7.60 8.90
Burner injectors:
Quantity 1 Propane/Butane
(G31/G30) mm4.50 4.50 5.60
Nat. Gas (G20) mbar 20(GB) / 20(IE)2)
Propane (G31) mbar 37 2)
Gas supply
pressure Butane (G30) mbar 28-30 2)
Nat. Gas (G20) m3/h 5.59 8.36 10.26
Propane (G31) m3/h 2.16 3.23 3.97
Butane (G30) m3/h 1.64 2.45 3.01
Propane (G31) kg/h 4.12 6.16 7.57
Gas consumption (3)
Butane (G30) kg/h 4.17 6.23 7.65
NOX emission 100% G20 mg/kWh 127.32 128.48 129.79
NOX emission 50% G20 mg/kWh 78.48 97.81 112.22
Gas service connection ¾" BSP
Flue & Combustion air connection collars) mm100 130 130
Minimum airflow 4) at 15°C m3/h 5500 8500 10000
Temperature rise at minimum airflow K 28.6 27.6 28.9
Maximum airflow 4) at 15°C m3/h 8500 11800 14000
Temperature rise at maximum airflow K 18.5 20.0 20.6
Electrical connections and Fan motor rating 0.75-5.5kW / 400V 3N~50Hz
Total electric rating kW (Fan motor rating / 0,85) + 0,15
Appliance weight net kg 280 445 457
Protection grade IP 20
Quantity primary heat exchanger elements 6 9 12
3
1) All burner pressures measured with all casing panels fitted and service door open. Pressure regulator sealed and not adjustable without
high/low fire control.
2) G20: Pmin. 17mbar / Pmax. 25mbar---G30: Pmin. 20mbar / Pmax. 35mbar--G31: Pmin. 25mbar / P max. 45mbar.
3) Natural gas (G20): Hi 34,02 MJ/m³--Propane (G31): Hi 88,00 MJ/m³--Butane (G30): Hi 116,09 MJ/m³ @15 °C and 1013mbar.
4) Isothermic @15°C - maximum temperature rise 40K (Please check the separate leaflet 'ventilator curves for the desired airflow and/or
static pressure with adjusted fan motor ratings).

1403BSHH_AMEN,page 5/29
CONFIGURATIONS – DIMENSIONS - CLEARANCES
Figure 2
Top view Rear view
K
40
2289
J
6
3
4
E F E
230500
Side view
Front view
75 75 2159
2359
230500
684
988
100
47
G
458
940
D
1
2
5
7
B C
47
684
A min
150
min 730
min 2500
min 200
Type A B C ∅D E F G J K
055 840 29 581 100 120 600 140 806 157
083 1468 236 899 130 134 1200 225 1434 301
102 1468 236 899 130 134 1200 225 1434 208
4
air inlet
flue outlet
electrical connections
gas connection ¾”
service panel
suspension points
condense drain dia 32 mm (female)
6 6

1210SHH_AMEN,page 6/29
LOCATION & INSTALLATION
5.1 General
5.1.1 Location heater
For best results, the heater should be placed with
certain rules in mind. Always ensure that minimum
clearances are maintained (cfr. figure 2). When
possible, heaters should be arranged to blow toward or
along exposed wall surfaces.
Suspended heaters are most effective when located as
close to the working zone as possible, but care should
be exercised to avoid directing the discharged air
directly on to room occupants.
Partitions, columns, counters or other obstructions
should be taken into consideration when locating the
unit heater so that a minimum quantity of airflow will be
deflected by such obstacles.
When units are located in the centre of the space to be
heated, the air should be discharged toward the
exposed walls. In large areas, units should be located to
discharge air along exposed walls with extra units
provided to discharge air in toward the centre of the
area. For optimum results heaters are best used in
conjunction with recirculating air fans suspended at high
level.
At those points where infiltration of cold air is excessive,
such as at entrance doors and shipping doors, it is
desirable to locate the unit so that it will discharge
directly toward the source of cold air, typically from a
distance of 4.5 to 6.0 meters or install a down flow unit
over the door opening.
Do not locate the heater where it
may be exposed to water or where
the ambient temperature exceeds
40°C.
The presence of chlorine vapours in the combustion air
of gas-fired heating equipment presents a potential
corrosion hazard.
Care should be taken to separate these vapours from
the combustion process. This may be done by wise
location of the unit flue and combustion air terminals
with regard to exhausters or prevailing wind directions.
Chlorine is heavier than air. Keep this fact in mind when
determining installation location of the heater in relation
to building exhaust systems.
Where chlorine vapours are prevalent heaters with
special grade 316 AISI stainless steel heat exchangers
are recommended.
5.1.2 Installation heater
Figure 2 shows the clearances necessary to ensure that
safety from combustibles and for servicing are
maintained. In the event that the appliance is required
to be installed on the floor then a non-combustible base
must be provided.
Installation on a base is required when the air handler is
composed of more than a heating and ventilation section
– suspension becomes here forbidden.
In case the installation is done by means of supporting
points, make sure that the distance between supporting
points does not exceed 1.5m. In general it is
recommended to support the base where it is screwed
down with supporting points.
Ensure that the structural elements, which will be used
to suspend or support the appliance, are adequate to
carry the weight of the appliance and its ancillary
components i.e. the flue system.
The location where the air heater is to be installed must
provide sufficient space around the heater for servicing
and clearances for safety. Beware to allow space for
the passage of vehicles i.e. lift trucks, etc …
Ensure that the air heater is installed in a level plain.
The heater must be fastened securely to any base
mount framework.
Four-point suspension is possible from the Ø 11.0 mm
holes provided in the base frame. Using drop rods etc.
Ensure that suspension fixings are lock nut secured to
secure against loosening.
When suspended, the air heater should be rigid so as to
avoid placing a stain on the flue system and connected
services.
Figure 3 : Detail fixation (only if unit & framework is
a one-part construction)
Table 2: Clearances (mm) (we also refer to figure 2)
BSHH Minimum
distance wall
not controls
side
Minimum
distance wall
controls side
Minimum
distance
floor-bottom
Minimum.
distance
ceiling-
top
055 150 730 2500 200
083 150 730 2500 200
102 150 730 2500 200
5
Hanger rod M10
2x nut &
2x washer M10

1403BSHH_AMEN,page 7/29
5.2 Duct connections
The air heaters are designed to be used in conjunction with
intake and or discharge ducting. A positive seal should be
made between any ducting and the air heater. A flexible
connection is desirable to eliminate transmission of noise
and to take account of thermal expansion. Figure 5
illustrates a method of connection between the appliance
and the duct using a proprietary patented connection
system.
Consideration should be given to the application of duct
fittings directly connected to the appliance. Air inlet and
outlet elbows, transitions etc. should be designed to ensure
an unrestricted and turbulent free air flow. This requirement
is to ensure that an even air temperature is maintained
when leaving the appliance thus eliminating heat exchanger
"hot-spots" and nuisance shut-down of the burner due to
over heating.
Figure 4 : Recommended procedure and method for connection of ducting and transitions to the air heaters using
a typical proprietary flange system.
1 Corner jointing framework 2 Cleats between sections to be joined
3 Fastening through all members 4 Checking alignment and joint worthiness
5 Applying gasket seals to prevent air leakage 6 Sectional view of completed joint
COMBUSTION AIR SUPPLY & FLUE SYSTEM
6.1 General
6.1.1 Flue requirements
IMPORTANT
The flue must be installed in accordance with
national and local regulations. Failure to provide
proper flueing could result in death, serious
injury and/or property damage. The air heater
must be installed with a flue to the outside of the
building. Safe operation of any power vented gas
apparatus requires a properly operating flue
system, correct provision for combustion air and
regular maintenance and inspection.
Model BSHH heaters may be installed as Type-B and
Type-C installations.
Flue must be in accordance with BS6230 or BS5440.
Local requirements may apply in addition to national
requirements. These unit heaters are designed to
operate safely and efficiently with either a horizontal or
vertical flue system when installed with the specific
requirements and instructions.
If this heater is replacing an existing heater, be sure that
the flue is sized properly for the heater being installed
and that the existing flue is in good condition.
6
Cut and assemble flange
into frame to suit opening Check dimensions and position on duct spigot.
Ensuring flange is mated
correctly before fastening. Checking location after
positioning.

1210SHH_AMEN,page 8/29
A properly sized flue system is required for safe
operation of the heater. An improperly sized flue system
can cause unsafe conditions and/or create condensation.
The air heaters may be installed as a balanced flue (type
C) heater requiring both a combustion air inlet duct and a
flue pipe or as a power vented heater (type B) (the
combustion air is taken from the space where heater is
installed), which requires only a flue pipe exhausting to
outdoors.
All products of combustion must be flued to outdoor
atmosphere. Each heater installed as a type B appliance
must be fitted with an individual flue pipe and the
combustion air inlet opening must be provided with a
protection grill.
Each heater installed as a type C appliance must be
fitted with an individual combustion air/flue pipe system.
Type C2 appliance, with single duct system for supply of
combustion air and evacuation of flue gasses, are not
allowed.
6.1.2 Diameter & maximum flue pipe lengths
Flue pipe diameters and maximum pipe lengths in table 3
apply to both horizontal and vertical systems.
Add all straight sections and equivalent lengths for
elbow. The total combined length must not exceed the
maximum flue length.
6.1.3 Venter outlet attachment requirements
Depending on the size of flue pipe as determined in table
3, attach either the flue pipe directly to the collar or a
taper-type connector.
Table 3 : Maximum flue system pipe lengths
flue pipe 100 130 130
inlet pipe 100 130 130
flue pipe 9 9 9
inlet pipe 9 9 9
flue pipe 9 9 9
inlet pipe 9 9 9
flue pipe 0,75 0,75 0,75
inlet pipe 0,75 0,75 0,75
flue pipe 1,5 1,5 1,5
inlet pipe 1,5 1,5 1,5
Equivalent length of 90°
elbow m
Max straight length vert.
flue outlet connection m
Equivalent length of 45°
elbow m
Heater socket & pipe dia mm
Max straight length hor.
flue outlet connection m
BSHH 055 083 102
- Use only one type of flue pipe dia
- recommended minimum flue length = 1m
IMPORTANT : CONDENSE DRAIN
A condense drain with trap must be fitted to the unit to
properly drain all condensation. The flue must be
installed in accordance with national and local
regulations. Failure to provide proper flueing could result
in death, serious injury and/or property damage. The air
heater must be installed with a flue to the outside of the
building. Safe operation of any power vented gas
apparatus requires a properly operating flue system,
correct provision for combustion air and regular
maintenance and inspection. The combustion products
are loaded with moisture, some of which will condense
out within the flue. No condensate leakage is permitted.
BSHH indoor horizontal flue runs must rise by 1° (17mm
per meter) from the appliance to ensure that the
condense returns to the flue drain.
Gasket sealed single wall seamless heavy gauge
aluminium pipes are required for use with condensing
gas appliances. All joints must be sealed to prevent
leakage of flue gases or condensation into the building.
For testing, the flue pipe should include a sealable test
point. Ideally the test point should be at least 450mm
away from the air heater flue connection socket.
However if a concentric flue is attached directly to the
connection sockets then the combustion should be tested
through the flue outlet collar via a drilled test point which
must be securely plugged on completion. Follow the flue
pipe manufacturer’s installation instructions for making
joints, including connections to the air heater, for
passing through a building element and for support
requirements.
Figure 5a
Figure 5b Figure 5c
Electrical heating resistance
Figuur 5d Figuur 5e
Antifrost thermostat
inside unit to be set
at 3 - 5°C
Electrical heating
resistance External sensor for
antifrost thermostat
Electrical heating resistance
positioned inside condensate
trap
Connection for PVC
tube dia 40mm
Condensate trap
(option nr OP928) Sensor
thermostat
Dia 32mm connection

1403BSHH_AMEN,page 9/29
D
C
min50mm
A PVC tube with collar of dia 32 is provided to drain the
condensate from the heat exchanger. The condensate
trap is optional.
Ensure that dimensioning of condensate drain can
handle condense rates as indicated below.
Condense drain rates of flow
BSHH 055 083 102
Nat. gas l/h 22 33 41
Propane l/h 13 19 24
REMARK : Fill condensate trap with clean water before
commissioning the unit.
Figure 6
D = minimum 130mm
C = D + minimum 50mm (= min. 180mm)
Condensate trap (option nr OP928)

1210SHH_AMEN,page 10/29
6.2 Type B appliances
6.2.1 Flues for power vented installations
If the air heater is to be installed as a type B appliance,
air for combustion will be taken from within the space
where the heater is installed.
Single wall flue seamless aluminium or stainless steel
pipes are required. All joints must be sealed to prevent
products of combustion from leaking into the building. If
the flue passes through a combustible element of the
building it must be enclosed by a sleeve of non-
combustible material and separated from the sleeve by a
minimum of 25 mm air break. The temperature of any
combustible material near to the flue must not exceed
65°C when the heater is in operation. The flue must be at
least 150 mm away from any combustible material.
Single wall flue pipe exposed to cold air or run through
unheated areas should be insulated. Where
condensation is unavoidable, provision must be made for
the condensation to flow freely to a point to which it can
be released, i.e. a drain or gully. The condensation drain
from the flue must be constructed from non-corrodible
material not less than 20 mm diameter. Copper or copper
based alloys must not be used for condensation drains.
For testing, the flue pipe should include a sealable test
port. The port must be at least 450 mm away from the air
heater flue connection socket.
Follow the flue pipe manufacturer’s installation
instructions for making joints, including connections to
the air heater, for passing through a building element
and for support requirements.
6.2.2 Air supply
Ensure that an adequate air supply for combustion and
ventilation is provided within the building in accordance
with BS6230/BS5440 plus other relevant regulations &
rules in force.
It is important to ensure that there is an adequate air
supply at all times for both combustion and heating
requirements.
Modern buildings involve greater use of insulation,
improved vapour barriers, and weather proofing. These
practices mean that buildings are sealed much tighter
than in the past.
Proper combustion air supply for a power vented Type B
installation requires ventilation of the heated space.
Natural infiltration of air may not be adequate. Use of
exhaust fans aggravates this situation. It is important to
ensure that there is adequate combustion air supply at
all times. Reliance on doors and windows is not allowed.
Ensure that the air combustion inlet opening at the side of
the unit cannot be obstructed (cfr. fig 7b).
When these air heaters are installed in type B
applications, designed to take air for combustion
from the space in which it is installed. Do not
restrict the combustion air intake.
Figure 7a : Approved appliances type B
B52/B22* – Roof
* : only Belgium
B52/B22* – Wall
Figure 7b : Type B appliances – Combustion air and
flue pipe sockets
1 Combustion air inlet opening
2 Flue pipe outlet collar



1403BSHH_AMEN,page 11/29
6.3 Type C appliances
Balanced flue air heaters are designed to be fitted with a
combustion air inlet duct that obtains outdoor air and a
flue pipe that exhausts flue products to outdoors.
Single wall flue seamless aluminium or stainless steel
pipes are required. All joints must be sealed to prevent
products of combustion from leaking into the building. If
the flue passes through a combustible element of the
building it must be enclosed by a sleeve of non-
combustible material and separated from the sleeve by a
minimum of 25 mm air break. The temperature of any
combustible material near to the flue must not exceed
65°C when the heater is in operation. The flue must be at
least 150 mm away from any combustible material.
Single wall flue pipe exposed to cold air or run through
unheated areas should be insulated. Where
condensation is unavoidable, provision must be made for
the condensation to flow freely to a point to which it can
be released, i.e. a drain or gully. The condensation drain
from the flue must be constructed from non-corrodible
material not less than 20 mm diameter. Copper or copper
based alloys must not be used for condensation drains.
For testing, the flue pipe should include a sealable test
port. The port must be at least 450 mm away from the air
heater flue connection socket.
Follow the flue pipe manufacturer’s installation
instructions for making joints, including connections to
the air heater, for passing through a building element
and for support requirements.
Type C2 appliances must not be applied !
Figure 8a : Type C appliances - Combustion air and
flue pipe sockets
Figure 8b : Approved appliances type C
C12
C32 C42
C52 C82
Concentric wall or roof terminal needs to be Mugro type 2000 (M&G) or Burfix (dia 100 or dia 130)
1 Combustion air inlet opening
2 Flue pipe outlet collar

1210SHH_AMEN,page 12/29
Attention: Serious damage can occur to burner
relay when faulty connection of thermostat, reset
switch or burner failure lamp. Switching of wires
for reset switch and flame failure (e.g. in a remote
control box
)
will destro
y
the burner rela
y
.
GAS CONNECTION
Connection to a gas service may only be carried out by
suitably qualified persons. All piping must be in
accordance with requirements outlined in the National
Gas Codes (different for each country). Gas supply
piping installation should also conform to good practice
and any local codes. Support gas piping with pipe
hangers, metal strapping, or other suitable material.
Do not rely on the unit to support the gas
pipe!
All sealing products shall be resistant to the action of
liquefied petroleum gas or any other chemical
constituents of the gas being supplied. Install a ground
joint union and manual shutoff the gas cock upstream of
the unit control system (see figure 9). The unit is
equipped with a nipple that extends outside the cabinet.
The gas connection is 3/4”. Leak test all connections by
brushing on a leak detecting solution. Check that the
gas category is in accordance with the data described
on the air heater. An adequate gas supply sized to
provide the dynamic pressure for the volume required by
the air heater(s) is essential to maintain the nominal
heat input.
Ensure that a gas supply line includes a filter and has
been tested and purged in accordance with prescribed
practice prior to commissioning and taking the air heater
into service.
This appliance is equipped for a
maximum gas supply pressure of
50mbar. Pressure testing supply piping:
test pressures above 50mbar:
disconnect the heater and manual valve
from the gas supply line that is to be
tested. Cap or plug the supply line..
Figure 9 :
Gas connection detail
NEVER use a
FLAME
to test for GAS
SOUNDNESS !
ELECTRICAL CONNECTION
8.1 Electrical supply & connections
The electrical installation may only be carried out by an
appropriately qualified person current to IEE
Regulations. The supply line to the heater should
include a main switch adjacent to the appliance. The
minimum clearance distance between the contacts must
be more than 3 mm. All electrical connections should be
made in the heater control compartment (refer to figure
10). Connections should be in accordance with the
terminal markings and the wiring diagram affixed to the
air heater. The minimum external control required for the
air heater is a room thermostat. It is essential that the
main input line and neutral to terminals L and N
remain live at all times even when the heater is
switched off to ensure correct operation of the unit
and to let the fan operate independent of the heating
control. Never incorporate controls that isolate the
appliance electrically.
A burner reset switch with red indicator light is fitted on
the heater. To add a remote reset button, make
connections to the terminals in the electric box as
indicated on the wiring diagram.
IMPORTANT : If the reset button requires activating
for any reason, the cause must be determined. After
determining and correcting the problem, restart the
heater and monitor long enough to ensure proper
operation (approx. 5 minutes).
Check that the electrical specification is in
accordance with the specified data on the
air heater. A unique appliance wiring
diagram is supplied as a separate document
attached to this one plus an additional copy
attached to the air heater.
These appliances must be earthed.
8.2 Thermostat controls
Ancillary controls are required to provide timed heat
cycles, room comfort temperature level, frost protection,
override air circulation etc. These are not included with
the appliance and should be ordered separately.
Do not attempt to control more than 1 air heater from
a single thermostat or control panel unless a properly
wired relay is fitted. Follow the instructions supplied
with such panels.
The location of the room thermostat or sensor is very
important. It should not be positioned on a cold wall or
cold surface. Avoid location in draughty areas or where it
may be influenced by heat sources e.g. the sun, process
plant, etc. The thermostat should be mounted on a
vibration free surface and mounted about 1,5 metres
above floor level. Follow the thermostat manufacturers
instructions. The thermostat must be suitable for
potential free contacts.
8.3 Fan motors
The centrifugal blowers fitted to the BSHH/RHH air
heaters are of the forward curved type therefore, the
speed setting for the static pressure imposed by the air
distribution system will govern the motor loading. All
heaters leave the factory with the drives set to the
specified conditions of the appliance. Table 4 provides
the motor characteristics for the various sizes. Refer to
section 9 to learn how to carry out adjustments necessary
to alter the fan speed and motor load factors.
Table 4 : Maximum motor load rating
(1) only possible on 083 model
7
8
Motor rating kW
Phase ~133333333333333
Voltage V 230 230 400 230 400 230 400 230 400 230 400 230 400 230 400
Load rating A 5,2 3,3 1,9 4,5 2,6 5,9 3,4 8,3 4,8 11 6,5 15 8,6 19 11
345,50,75(1) 1,1 1,5 2,2

1403BSHH_AMEN,page 13/29
8.4 Wiring connections on the terminal board
Figure 10 :
Low
Voltage
Thermistor Room
or Duct Sensor
240V
J1
3 phase
415V 3N 50Hz
AS1
Mains Isolator -
Must be installed within
1 metre of the appliance
Room/Duct
thermostat
Time control
Slave / Master
Connections
(If Required)
240V
J1
Fan only facility Lock-out lamp
(240V)
Lock-out reset
Power Supply
External Controls
Energymizor Mk3
Permanent
Mains Supply
Other Controls
230V
J1
5. Controls cables 0,75 mm for
up to 200 metre run.
Fuse rating must be sufficiently
sized to handle heater & motor
loadings.
Energymizor Sensorcable
0,25mm (screened)
Master/slave cable 0,1mm,
bell wire type (no screen
necessary)
8.
6.
7.
Retain/insert link wires shown solid
Terminals shown may notbein
numerrical order. Unused terminals
may not be shown atall.
Remove link wires showndotted
1 Phase supply cable 2,5 mm
minimum.
N
o
t
es:
4.
3.
2.
1.
Legend:
Heater terminals
Controls terminals

1210SHH_AMEN,page 14/29
COMMISSIONING, LIGHTING and OPERATION
9.1 Commissioning
Normally BSHH air heaters do not require
commissioning. Final testing after production ensures
that, if installation has been carried out by a suitably
qualified person and strictly in accordance with this
document, the appliance is ready to be taken into
service.
9.1.1 Checks
Prior to start up heater, carry out following checks to
ensure :
oCheck suspension . Unit must be secure. Verify that
no other parts are fitted which are not individually
supported and secured.
oCheck piping for leaks and proper gas line pressure.
Bleed gas lines of trapped air.
o Check electrical wiring and ensure that wiring
conforms to the wiring diagram. Be sure all wire
sizes meet requirements.
oPhase supply cable to correct terminals.
oCheck polarity. Verify that line voltage exists
between the black “L1” and earth ground.
oVerify that the appliance is earthed by conducting an
earth continuity test.
oCurrent rating and fuse value.
oCorrect supply gas pressure.
oCorrect burner gas pressure.
oSatisfactory & smooth ignition.
Supplementary checks in case of an BSHH
installation:
o Check clearances from combustibles. Requirements
are in section 5.
o Check vent system to be sure that it is installed
according to the instructions in section 6, venting
requirements.
oCheck if condensate drain trap is filled with clean
water.
9.1.2 Heater start-up
For your safety, follow the instructions
exactly otherwise damage or injury
could occur !
oThis heater does not have a pilot flame. It is
equipped with an ignition device that automatically
lights the burner. Do not try to light the burner by
hand.
oBefore operating, smell all around the heater area
for gas. Be sure to smell next to the floor because
propane gas is heavier than air and will settle near
the floor.
oDo not use this appliance if any part has subjected
to water ingress. Immediately call a qualified
service technician to inspect the appliance and to
replace any part of the control system and any gas
control.
oWhen overheating occurs or when gas supply is not
turned off, shut the manual gas tap before turning
off the electric power.
oIn addition to the above requirements checks to
ensure that the fan performance and motor load
factors are correct for the application and in
accordance with the appliance data plate.
9.1.3 Drives : general and adjustments
Adjustment may be necessary to set the fan duty for the
static pressure and motor load requirements. Before
starting work on the fan assembly:
oSet external controls to off or their lowest setting.
oTurn OFF the gas supply to the air heater.
oSwitch OFF the electricity supply to the air heater
after the air circulating fan has stopped.
oCarry out adjustments as appropriate.
N.B. Rotational speed checks should be carried out
using an infrared tachometer or stroboscope.
Adjusting the fan speed can be carried out by altering
the diameter of the adjustable drive pulley on the motor
shaft.
oLoosen the belt tension device and remove he
drive belt.
oRefer to figure 11 and note that the outer section
of the drive pulley is secured by a hexagon socket
screw to a flat on the pulley hub, this is positioned
by loosening the hexagon socket screw
sufficiently to enable the pulley to be either
opened or closed by turning it on the thread on
which it is engaged.
oIt should be noted that one complete turn of the
pulley half is equal to approximately 8% of the fan
speed. Closing the pulley increases the speed and
opening decreases the speed.
oAfter making speed adjustments tension belt in
accordance with the dimensions given in figure
11 and check pulley alignment to ensure the belt
runs correctly.
N.B. Always ensure that the pulley is tightened onto a
flat of the hub before switching on the fan, even when
testing a reset condition.
Opening the pulley too far will cause the belt to
touch the bottom of the V grove resulting in a
significant reduction of belt life time and loss of
grip.
If the amount of adjustment is not achieved with the
range obtainable with the pulleys fitted, it will be
necessary to change the driven pulley fitted on the
blower and possibly the size of the drive V belt. After
adjustment ensure the motor load rating is not exceeded!
9

1403BSHH_AMEN,page 15/29
Figure 11 : Pulley and drive belt adjustment
9.2 Ignition system
oEnsure that air discharge louvers are set to open.
oSwitch on electrical supply.
oTurn on gas supply.
oSet time switch (if fitted) to an 'ON' cycle.
oSet room thermostat to 'ON' position.
oIf reset button on heater and/or on remote control (if
fitted) lights up, press reset button.
oThermostat calls for heat, energizing the venter
motor.
oWhen adequate airflow for combustion is proven by
an air proving switch and a prepurge period has
elapsed, the integral igniter and multifunctional gas
control operate. The ignition spark ignites the gas
creating the burner flame.
oBurner flame is sensed by a flame rod sensor and
when the heat exchanger is warmed up (+/- 30
seconds) and the fan control relay closes, the fan
motor is energized.
oIf the flame is extinguished during the main burner
operation, the integrated control system closes the
main valve and attempts to relight the burner. The
unit will attempt 5 ignitions before entering a “lock
out” mode. Lock out is indicated by the red warning
light on the heater. To end this mode push on the
reset switch.
oFor a new installation or if the appliance has been
turned off for an extended period then up to 3
attempts to light the air heater may be necessary. If
the heater still does not light, consult the fault-
finding guide.
9.3 Operation
In case of a not continuous running fan (= ventilation),
simultaneously to the ignition circuit and gas valve circuit
being energised, electrical power is supplied to a time
delay relay that will activate the fan. The air circulation
fan will start after about 20 à 60 seconds.
In the event of the combustion air volume falling below a
safe level, the burner will be extinguished a re-start cycle
will commence after adequate combustion air volume has
been restored.
If the burner flame is extinguished for any reason during
a run cycle, an automatic attempt for re-ignition will take
place, if the burner does not relight after 5 attempts,
then safety shut down and lockout will occur. Manual
intervention to reset is necessary to put the air heater
back into service.
In the event of overheating for any reason, thermally
activated fail safe overheat controls operate to switch off
the burner.
The overheat control (LC3), will switch off the burner and
itself set to a lockout condition which also requires
manual intervention to reset to restore the heater to
operational condition. A cooling time of 1 minute is
necessary before thermal re-setting can be carried out
When the set temperature or the heating time period has
been reached, electrical power to the burner relay will be
switched off and the burner will extinguish. In case of a
not continuous running fan, the air fan will continue to
run for about 60 – 120 seconds until the heat exchanger
has been cooled down to a safe level.
To turn off the air heater for a short period,
a) turn room thermostat to lowest setting.
b) to relight reset thermostat.
To turn off the air heater for prolonged period;
a) turn room thermostat to low setting or ‘OFF’ position
b ) shut off gas supply to the appliance
c) switch off electricity supply to the air heater after air
circulation fan has stopped.
d) to relight follow lighting instructions.
The gas service tap must only be operated in
emergencies, for servicing or prolonged periods of
shutdown of the air heater.

1210SHH_AMEN,page 16/29
Figure 12 : Ignition system
The BSHH heater is equipped with a direct spark integrated control relay. The control relay monitors the safety devices
and controls the operation of the venter motor and the gas valve between heat cycles.
The time line below illustrates a normal heat cycle.
The time line below illustrates a normal heat cycle.
Definitions
•Start position: The system is not in lockout position and can proceed with the start-up sequence upon a demand for
heat.
•Pre-purge time: This is a period of 20 seconds during which the combustion fan (venter) operates prior to activation
of the ignition device.
•Safety time: The safety time is the delay between the gas valve being energized and the flame sensor checking
for the presence of a flame. This is a period of 5 seconds.
Note: If no flame is sensed, the burner relay will attempt ignition 5 times before going into lock-
out mode.
•Post-purge time: This is the time of 10 seconds between burner shutdown and the moment the combustion fan (venter)
is de-energized.
Start pre-purge
Energisation of venter motor.
If the differential pressure switch
is in normally closed position
(start position).
Powerto gas valveand ignitor
Sensor checks for the presence of a flame
End of heat demand.
De-energisation of gas valve.
De-energisation of venter motor
First heat demand signal.
Check on pressure switch.
Must be in closed or start position.
If not, there will be no power to
the venter motor.
The power tothe burner relayis off
until the pressure switch goes to
normally closed - or start position.
Safety check on flame sensor.
If there is a flame, the relay will
go to lock-out. The light in the red reset
switch, mounted visibly onthe heater
will glow.
Line outputduring ignition time to control
high fire start on two stage or modulation
applications.
If no flame, then repeat starting
at pre-purge for 5 attempts.
If no ionisation after 5 attempts, then
lock-out.
Pre-purge
time
Ignition
time=
Safety
time Normal operation of burner relay Post-purge time
20 sec 5 sec 10 sec time
Start position

1403BSHH_AMEN,page 17/29
9.4 Burner gas pressure adjustment
The gas pressure is set for the required heat input before
the appliance leaves the factory. Provided that the gas
supply to the air heater is in accordance with the supply
pressure described on the appliance data plate, the
operating pressure will not require adjustment.
To check the pressure use the following procedure:
oAscertain from the heater’s data plate the correct
operating gas pressure;
oTurn the room thermostat control to its lowest
setting;
oConnect a manometer to the test point on the gas
manifold;
oAdjust the room thermostat to call for heat i.e. above
room ambient temperature;
oObserve the burner gas pressure on the manometer
and compare to the required pressure on the data
plate;
oIf necessary, adjust the burner gas pressure. Remove
the cover screw. Turn the regulator screw anti-
clockwise to decrease pressure or clockwise to
increase pressure (see figure 13). Adjusting the burner
pressure may only be carried out by suitably qualified
persons.
oSet room thermostat to lowest setting to turn OFF the
burners. Replace the test point screw/cap and with the
main burner OFF, test for gas soundness using a leak
detector fluid.
Reset temperature control/room thermostat to comfort
operating level.
Figure 13: Honeywell gas valve
1) Gas inlet
2) Gas outlet
3) Inlet pressure tap
4) Outlet pressure tap
5) 6.3mm AMP terminals and screws for wiring
6) 6.3mm AMP terminals
7) Earth terminal/screw (line voltage models only)
8) Pressure regulator adjustment screw
Table 5 : Burner jets and pressures
055 083 102
Burner jet dia 6,80 7,60 8,40
Burner pressure mbar 8,30 10,40 8,80 inlet pressure
20 mbar
Burner jet dia 4,50 4,50 5,60
Burner pressure mbar 15,70 34,36 23,50 inlet pressure
37 mbar (*)
BSHH
Nat Gas
G20
Prop Gas
G31

1210SHH_AMEN,page 18/29
TWO STAGE BURNERS SETTING & ADJUSTMENT
The BSHH air heaters can be optionally equipped with
two stage burners. The type of gas control fitted is the
"Honeywell" VR 4601P/B or VR 4601A/B either are fitted
with a two-stage pressure governor model V4336A.
Regulation is possible for the pressure range 1,5 - 20
mbar for natural gas and 4 -37 mbar for propane gas.
The appliances are fitted with a relay to ensure that
during burner start-up the initial firing rate is 100% to
ensure good burner cross lighting.
Adjusting the burner pressure may only be carried out
by suitably qualified persons.
Setting (refer to figure 14) :
Allow time for pressure to stabilise before and during
making adjustments.
a. Lever off the plastic cover cap
b. Maximum high rate setting must be adjusted
first after which the minimum low rate setting can be
adjusted. Any adjustment of the maximum setting
influences the minimum setting.
c. Do not adjust maximum or minimum settings above
or below the pressures stated on the air heater data
plate.
Adjusting maximum pressure setting :
a. Energise high/low regulator, set gas control in
operation and wait until an outlet pressure is
recorded on pressure gauge.
b. Use a 10 mm screwdriver to turn adjustment screw
for maximum pressure setting clockwise to increase
and counter-clockwise to decrease pressure until
desired maximum pressure is obtained.
c. Check maximum pressure setting several times.
Adjusting minimum pressure setting :
a. Disconnect electrical connection of high/low
regulator.
b. Set gas control in operation and wait until an
outlet pressure is recorded on pressure gauge.
c. If minimum pressure setting needs adjustment
then use a 3.5 mm screwdriver to turn adjustment
screw for minimum pressure setting, clockwise to
increase or counter-clockwise to decrease
pressure, until desired minimum pressure setting
is obtained.
d. Wire high/low regulator in circuit.
e. Check maximum pressure setting, re-adjust if
necessary and check minimum pressure again.
Figure 14 :
Table 6 : High/low burner gas pressures and low rate consumption values
055 083 102
nat. G20 mbar 8,30 10,40 8,80
prop. G31 mbar 15,70 34,26 23,50
nat. G20 mbar 2,08 2,60 2,20
prop. G31 mbar 3,92 8,59 5,87
nat. G20 m³/h 2,79 4,18 5,13
prop. G31 kg/h 1,08 1,61 1,98
(1) -
-
Low fire rate must not be reduced below the values stated above for 50 % RATING
Gas consumption @ 50%
Ref. 15°C, 1013mbar (1)
nat gas G20 net calorific value 34,02 MJ/m³ @ 15°C & 1013 mbar
prop gas G31 net calorific value 88,00 MJ/m³ @ 15°C & 1013 mbar
Note : burner pressures for propane gasses are approx. Based on regulated supply pressure
Model
Pressure @
100%
Pressure @
50%
Burner
pressure
10

1403BSHH_AMEN,page 19/29
GAS CONVERSION
This air heater is designed to operate on natural,
propane or butane gas and will be supplied as ordered
for the gas type specified. In the event it is required to
convert to a different gas type to that which has been
supplied, conversion of the gas burner must be carried
out. This can only be carried out by an appropriately
qualified person current to IEE regulations
An approved conversion kit to suit the appropriate gas
type must be used.
In addition to changing the burner injectors, and
adjusting the burner gas pressure (pressure regulator
or throttle adjusting screw), for sealing the governor or
the throttle adjusting screw it is necessary to fix data
plate over stickers as supplied with the conversion kit
of parts (propane see figure 15).
After conversion re-commission appliance according to
section 9 of this document.
Remark: Always check the propane gas quality, a too
high percentage of butane can cause sooting of the
heat exchanger.
Figure 15
Table 7 : High/low burner gas pressures
055 083 102
Injector dia (1x) mm 6,80 7,60 8,90
burner pressure 100% mbar 8,30 10,40 8,80
burner pressure 50% mbar 2,08 2,60 2,20
Injector dia (1x) mm 4,50 4,50 5,60
burner pressure 100% mbar 15,70 34,36 23,50
burner pressure 50% mbar 3,92 8,59 5,87
Natural
gas G20
Type
Propane
gas G31
MAINTENANCE & SERVICE
12.1 Maintenance schedule
General:
Before commencing servicing, turn off the main gas
supply and switch off the main electricity supply after the
air circulation fan has stopped.
The heater will operate with a minimum of maintenance.
It is recommended that maintenance is carried out at
least once a year by a suitably qualified person. More
frequent servicing may be required dependent upon the
environmental circumstances where the air heater is
installed. Regular inspection is necessary, especially in
dirty areas, to assess the servicing frequency.
Check condition and security of flue and combustion air
system.
Check for security and worthiness of the suspension or
mounting system.
Maintenance Schedule:
The following procedures should be carried out at least
once each year (see figure 16).
• Clean all dirt, lint, and grease from the fan and motor.
• Check the heat exchanger and externally for evidence
of physical damage.
• Check the burner for scale, dust, or lint accumulation.
Clean if required.
• Check the vent or vent/combustion air system for
soundness. Replace any parts that do not appear
sound.
• Check the wiring for any damage. Replace damaged
wiring.
11
Throttle adjustment screw
12

1210SHH_AMEN,page 20/29
Figure 16a : Location components BSHH models
1
2
4 5 76
89 10 11 1213
3
Figure 16b :Detail wiring panel
1. Burner lockout
indicator/reset
button
2. Wiring panel
3. Capillary thermal
overheat control
with manual
reset (LC3)
4. Gas connection
5. Cable entry
connections
6. Combustion flue
gas extraction
fan with motor
7. Blower
8. Motor
9. Drain
10. Combustion air
inlet
11. Flue gas outlet
12. Burner box
assembly
13. Gas manifold
injector & test
point
Components
14. Electronic burner
controller
15. Interference
suppresser filter
16. Time delay relay
17. Earthing
18. Wiring terminals for
electrical controls
19. Relay two stage (**)
20. Motor starter
21. Differential pressure
switch (flue gas)
22. Connexion supply
voltage
23. 24V relay (**)
24. GM44 (*) (**)
25. Relay
(*) = not illustrated
(**)= not standard
14
15
16 25
17
22 18
19
20
21
23